<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>data初始数据</title>
</head>
<body>
    <script src='/js/vue.js'></script>
    <div id='app'>
        {{msg}}
    </div>
    
    <script>
        let vm = new Vue({
         el: '#app',
         data: {
          msg:'初始数据'
         },
        });
        console.log('vm.$data.msg:'+vm.$data.msg);
        console.log('vm.msg:'+vm.msg);
    </script>
</body>
</html>